In Pakistani general election, 2008, Jahangir Tareen was re-elected as the member of the National Assembly for the second time from Constituency NA-195 on the ticket of Pakistan Muslim League (F). He was the parliamentary leader of PML-F in the National Assembly. Later, he formed a separate faction of parliamentarians, called "Tareen's group". At the start of 2011, he showed intent to launch his own political party consisting of politicians free from corruption charges, but later in November 2011, he joined Pakistan Tehreek-e-Insaf along with a number of associates saying that his vision was similar to PTI.
In September 2013, Imran Khan appointed Jahangir Tareen as the Secretary General of Pakistan Tehreek-e-Insaf to replace the previous Secretary General Pervaiz Khattak, who became the Chief Minister of Khyber Pakhtunkhwa after the Pakistani general election, 2013.
In August 2015, he retained its membership in the National Assembly after commission of Punjab election tribunal announced its verdict in favour of Tareen over a petition filed by the former secretary general of Pakistan Tehreek-i-Insaf (PTI) against alleged rigging in constituency Lodhran during the 2013 elections.